Pretest 1: Forces

Which of the following describes a force?

• A pull only

• A push only

• A push or pull or both

• Neither a push nor a pull

What is the unit of force in metric system?

• Calorie

• Joules

• Newtons

• Pounds

How do forces occur?

• in pairs

• in triplets

• by themselves

• as single quantity

When you move a chair across the floor, what force must your push be stronger than?

• friction

• magnetic

• normal

• tension

A 500 N lady sits on the floor. How much force the floor exerts on her?

• 50 N

• 250 N

• 500 N

• 1000 N

Which force always pulls the objects to the ground?

• applied

• friction

• gravitational

• tension

A leaf falls from a tree. What force(s) are acting on it?

• Air resistance only

• Gravitational force only

• Applied force and air resistance

• Air resistance and gravitational forces

When a cabinet touches the floor, which type of forces exist?

• Contact forces

• Balanced forces

• Non-contact forces

• Unbalanced forces

The Earth has a bigger mass than the Moon. If you were able to travel to the Moon, what happens to your weight?

• increases

• decreases

• stays the same

• varies with day and night

What is the net force in the figure above?

• 1 N, to the left

• 1 N, to the right

• 11 N, to the left

• 11 N, to the right